AudioBufferProvider.h revision ef5abc369823f634c460c8f24d3cbf310542fe3b
1/* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ANDROID_AUDIO_BUFFER_PROVIDER_H 18#define ANDROID_AUDIO_BUFFER_PROVIDER_H 19 20#include <utils/Errors.h> 21 22namespace android { 23// ---------------------------------------------------------------------------- 24 25class AudioBufferProvider 26{ 27public: 28 29 struct Buffer { 30 Buffer() : raw(NULL), frameCount(0) { } 31 union { 32 void* raw; 33 short* i16; 34 int8_t* i8; 35 }; 36 size_t frameCount; 37 }; 38 39protected: 40 AudioBufferProvider() : mValid(kValid) { } 41 virtual ~AudioBufferProvider() { mValid = kDead; } 42 43public: 44 // value representing an invalid presentation timestamp 45 static const int64_t kInvalidPTS = 0x7FFFFFFFFFFFFFFFLL; // <stdint.h> is too painful 46 47 // pts is the local time when the next sample yielded by getNextBuffer 48 // will be rendered. 49 // Pass kInvalidPTS if the PTS is unknown or not applicable. 50 virtual status_t getNextBuffer(Buffer* buffer, int64_t pts = kInvalidPTS) = 0; 51 52 virtual void releaseBuffer(Buffer* buffer) = 0; 53 54 int getValid() const { return mValid; } 55 static const int kValid = 'GOOD'; 56 static const int kDead = 'DEAD'; 57 58private: 59 int mValid; 60}; 61 62// ---------------------------------------------------------------------------- 63}; // namespace android 64 65#endif // ANDROID_AUDIO_BUFFER_PROVIDER_H 66